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@ARTICLE{HaberPohlmeier:187134,
      author       = {Haber-Pohlmeier, S. and Stapf, S. and Pohlmeier, A.},
      title        = {{NMR} {F}ast {F}ield {C}ycling {R}elaxometry of
                      {U}nsaturated {S}oils},
      journal      = {Applied magnetic resonance},
      volume       = {45},
      number       = {10},
      issn         = {1613-7507},
      address      = {Wien [u.a.]},
      publisher    = {Springer},
      reportid     = {FZJ-2015-00808},
      pages        = {1099 - 1115},
      year         = {2014},
      abstract     = {The bioavailability of water for plant nutrition in natural
                      soils is controlled by the pore system structure and the
                      interaction of water with the pore walls at variable degrees
                      of saturation. For the characterization of these processes T
                      1 relaxometry is particularly suitable because it is not
                      influenced by internal gradients and the frequency
                      dependence of T 1 includes detailed information about the
                      local dynamics at the pore walls. Using Fast Field Cycling
                      Relaxometry, we have determined T 1 relaxation dispersion
                      curves of unsaturated soil materials which cover a broad
                      range of textures between pure sand and silt-loam. The mean
                      relaxation rates scale inversely with the water content, as
                      expected according to the Brownstein–Tarr model, which
                      means that the effective pore volume is the only
                      water-contributing fraction. By further analysis of the
                      relaxation dispersion curves we find a bi-logarithmic
                      behavior which is describable by a model of two-dimensional
                      diffusion at the liquid–solid interface in the
                      neighborhood of paramagnetic impurities at the surface. The
                      microscopic wettability, as expressed by the ratio of
                      surface residence time and correlation time, is identical
                      for the soil material but decreases by a factor of two for
                      the sand. This relaxation mechanism is unique for all
                      textures and water contents and proves that the water
                      mobility at the surface does not decrease even at the lowest
                      water contents.},
      cin          = {IBG-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / 255 - Terrestrial Systems:
                      From Observation to Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344058800012},
      doi          = {10.1007/s00723-014-0599-2},
      url          = {https://juser.fz-juelich.de/record/187134},
}